Finding the Fourth Proportional to 2,577.49, 3,556.93 and 1,398.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.49 : 3,556.93 = 1,398.57 : x
2. Step 2: Convert to fraction form
   2,577.49/3,556.93 = 1,398.57/x
3. Step 3: Cross multiply
   2,577.49x = 3,556.93 × 1,398.57
4. Step 4: Simplify right side
   2,577.49x = 4,974,615.59
5. Step 5: Solve for x
   x = 4,974,615.59/2,577.49
6. Step 6: Final answer
   x = 1,930.02